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CMC Medical CMC-Medical VELLORE Solved Paper-2011

  • question_answer
    Which of the following reacts fastest with a mixture of anhydrous \[ZnC{{l}_{2}}\] and cone. \[HCl\]?

    A)  Trimethyl carbinol

    B)  Ethanol

    C)  Propanol

    D)  Methanol

    E)  Iso-propanol

    Correct Answer: A

    Solution :

                    Reactivity order of alcohols towards \[ZnC{{l}_{2}}\] and cone. \[HCl\] (Lucas reagent) is tertiary alcohol > sec alcohol > primary alcohol Trimethyl carbinol is\[C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{\mathbf{|}}{\overset{\mathbf{|}}{\mathop{C}}}\,}}}\,-OH\]. It is a tertiary alcohol, so reacts readily with anhy.\[ZnC{{l}_{2}}\] and concentrated\[HCl\].


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